diff --git a/rs41/rs41ecc.c b/rs41/rs41ecc.c new file mode 100644 index 0000000..26fc65e --- /dev/null +++ b/rs41/rs41ecc.c @@ -0,0 +1,1039 @@ + +/* + * radiosondes RS41-SG(P) + * author: zilog80 + * usage: + * ./rs41ecc [options] audio.wav + * options: + * -v, -vx, -vv (info, aux, info/conf) + * -r, --raw + * -i, --invert + * --crc (check CRC) + * --avg (moving average) + * -b (alt. Demod.) + * --ecc (Reed-Solomon) + */ +/* (uses fec-lib by KA9Q) + ka9q-fec: + gcc -c init_rs_char.c + gcc -c encode_rs_char.c + gcc -c decode_rs_char.c + gcc init_rs_char.o encode_rs_char.o decode_rs_char.o rs41ecc.c -lm -o rs41ecc +*/ + + +#include +#include +#include + +#ifdef CYGWIN + #include // cygwin: _setmode() + #include +#endif + + +#include "fec.h" + +#define rs_N 255 +#define rs_R 24 +#define rs_K (rs_N-rs_R) + +void *rs; +unsigned char codeword1[rs_N], codeword2[rs_N]; + +typedef struct { + int typ; + int msglen; + int msgpos; + int parpos; + int hdrlen; + int frmlen; +} rscfg_t; + +rscfg_t cfg_rs41 = { 41, (320-56)/2, 56, 8, 8, 320}; + + +typedef unsigned char ui8_t; + +typedef struct { + int frnr; + char id[9]; + int week; int gpssec; + int jahr; int monat; int tag; + int wday; + int std; int min; int sek; + double lat; double lon; double h; + double vN; double vE; double vU; + double vH; double vD; double vD2; +} gpx_t; + +gpx_t gpx; + +int option_verbose = 0, // ausfuehrliche Anzeige + option_raw = 0, // rohe Frames + option_inv = 0, // invertiert Signal + option_res = 0, // genauere Bitmessung + option_crc = 0, // check CRC + option_avg = 0, // moving average + option_b = 0, + option_ecc = 0, // Reed-Solomon ECC + wavloaded = 0; + + +#define HEADOFS 24 // HEADOFS+HEADLEN <= 64 +#define HEADLEN 32 // HEADOFS+HEADLEN mod 8 = 0 +#define FRAMESTART ((HEADOFS+HEADLEN)/8) + +/* 10 B6 CA 11 22 96 12 F8 */ +char header[] = "0000100001101101010100111000100001000100011010010100100000011111"; +char buf[HEADLEN+1] = "x"; +int bufpos = -1; + +#define NDATA_LEN 320 +#define XDATA_LEN 198 +#define FRAME_LEN (NDATA_LEN+XDATA_LEN) +ui8_t //xframe[FRAME_LEN] = { 0x10, 0xB6, 0xCA, 0x11, 0x22, 0x96, 0x12, 0xF8}, = xorbyte( frame) + frame[FRAME_LEN] = { 0x86, 0x35, 0xf4, 0x40, 0x93, 0xdf, 0x1a, 0x60}; // = xorbyte(xframe) + + +#define MASK_LEN 64 +ui8_t mask[MASK_LEN] = { 0x96, 0x83, 0x3E, 0x51, 0xB1, 0x49, 0x08, 0x98, + 0x32, 0x05, 0x59, 0x0E, 0xF9, 0x44, 0xC6, 0x26, + 0x21, 0x60, 0xC2, 0xEA, 0x79, 0x5D, 0x6D, 0xA1, + 0x54, 0x69, 0x47, 0x0C, 0xDC, 0xE8, 0x5C, 0xF1, + 0xF7, 0x76, 0x82, 0x7F, 0x07, 0x99, 0xA2, 0x2C, + 0x93, 0x7C, 0x30, 0x63, 0xF5, 0x10, 0x2E, 0x61, + 0xD0, 0xBC, 0xB4, 0xB6, 0x06, 0xAA, 0xF4, 0x23, + 0x78, 0x6E, 0x3B, 0xAE, 0xBF, 0x7B, 0x4C, 0xC1}; +/* LFSR: ab i=8 (mod 64): + * m[16+i] = m[i] ^ m[i+2] ^ m[i+4] ^ m[i+6] + * ________________3205590EF944C6262160C2EA795D6DA15469470CDCE85CF1 + * F776827F0799A22C937C3063F5102E61D0BCB4B606AAF423786E3BAEBF7B4CC196833E51B1490898 + */ + +/* ------------------------------------------------------------------------------------ */ + +// option_b: exakte Baudrate wichtig! +// im Prinzip in sync-preamble/header ermittelbar +#define BAUD_RATE 4800 + +int sample_rate = 0, bits_sample = 0, channels = 0; +float samples_per_bit = 0; + +int findstr(char *buff, char *str, int pos) { + int i; + for (i = 0; i < 4; i++) { + if (buff[(pos+i)%4] != str[i]) break; + } + return i; +} + +int read_wav_header(FILE *fp) { + char txt[4+1] = "\0\0\0\0"; + unsigned char dat[4]; + int byte, p=0; + + if (fread(txt, 1, 4, fp) < 4) return -1; + if (strncmp(txt, "RIFF", 4)) return -1; + if (fread(txt, 1, 4, fp) < 4) return -1; + // pos_WAVE = 8L + if (fread(txt, 1, 4, fp) < 4) return -1; + if (strncmp(txt, "WAVE", 4)) return -1; + // pos_fmt = 12L + for ( ; ; ) { + if ( (byte=fgetc(fp)) == EOF ) return -1; + txt[p % 4] = byte; + p++; if (p==4) p=0; + if (findstr(txt, "fmt ", p) == 4) break; + } + if (fread(dat, 1, 4, fp) < 4) return -1; + if (fread(dat, 1, 2, fp) < 2) return -1; + + if (fread(dat, 1, 2, fp) < 2) return -1; + channels = dat[0] + (dat[1] << 8); + + if (fread(dat, 1, 4, fp) < 4) return -1; + memcpy(&sample_rate, dat, 4); //sample_rate = dat[0]|(dat[1]<<8)|(dat[2]<<16)|(dat[3]<<24); + + if (fread(dat, 1, 4, fp) < 4) return -1; + if (fread(dat, 1, 2, fp) < 2) return -1; + //byte = dat[0] + (dat[1] << 8); + + if (fread(dat, 1, 2, fp) < 2) return -1; + bits_sample = dat[0] + (dat[1] << 8); + + // pos_dat = 36L + info + for ( ; ; ) { + if ( (byte=fgetc(fp)) == EOF ) return -1; + txt[p % 4] = byte; + p++; if (p==4) p=0; + if (findstr(txt, "data", p) == 4) break; + } + if (fread(dat, 1, 4, fp) < 4) return -1; + + + fprintf(stderr, "sample_rate: %d\n", sample_rate); + fprintf(stderr, "bits : %d\n", bits_sample); + fprintf(stderr, "channels : %d\n", channels); + + if ((bits_sample != 8) && (bits_sample != 16)) return -1; + + samples_per_bit = sample_rate/(float)BAUD_RATE; + + fprintf(stderr, "samples/bit: %.2f\n", samples_per_bit); + + return 0; +} + + +#define EOF_INT 0x1000000 + +#define LEN_movAvg 3 +int movAvg[LEN_movAvg]; +unsigned long sample_count = 0; +double bitgrenze = 0; + +int read_signed_sample(FILE *fp) { // int = i32_t + int byte, i, sample, s=0; // EOF -> 0x1000000 + + for (i = 0; i < channels; i++) { + // i = 0: links bzw. mono + byte = fgetc(fp); + if (byte == EOF) return EOF_INT; + if (i == 0) sample = byte; + + if (bits_sample == 16) { + byte = fgetc(fp); + if (byte == EOF) return EOF_INT; + if (i == 0) sample += byte << 8; + } + + } + + if (bits_sample == 8) s = sample-128; // 8bit: 00..FF, centerpoint 0x80=128 + if (bits_sample == 16) s = (short)sample; + + if (option_avg) { + movAvg[sample_count % LEN_movAvg] = s; + s = 0; + for (i = 0; i < LEN_movAvg; i++) s += movAvg[i]; + s = (s+0.5) / LEN_movAvg; + } + + sample_count++; + + return s; +} + +int par=1, par_alt=1; + +int read_bits_fsk(FILE *fp, int *bit, int *len) { + static int sample; + int n, y0; + float l, x1; + static float x0; + + n = 0; + do{ + y0 = sample; + sample = read_signed_sample(fp); + if (sample == EOF_INT) return EOF; + //sample_count++; // in read_signed_sample() + par_alt = par; + par = (sample >= 0) ? 1 : -1; // 8bit: 0..127,128..255 (-128..-1,0..127) + n++; + } while (par*par_alt > 0); + + if (!option_res) l = (float)n / samples_per_bit; + else { // genauere Bitlaengen-Messung + x1 = sample/(float)(sample-y0); // hilft bei niedriger sample rate + l = (n+x0-x1) / samples_per_bit; // meist mehr frames (nicht immer) + x0 = x1; + } + + *len = (int)(l+0.5); + + if (!option_inv) *bit = (1+par_alt)/2; // oben 1, unten -1 + else *bit = (1-par_alt)/2; // sdr#= 0) ? 1 : -1; // 8bit: 0..127,128..255 (-128..-1,0..127) + sum += sample; + + if (sample * sample0 < 0) pars++; // wenn sample[0..n-1]=0 ... + sample0 = sample; + + n++; + } while (sample_count < bitgrenze); // n < samples_per_bit + + if (sum >= 0) *bit = 1; + else *bit = 0; + + if (option_inv) *bit ^= 1; + + + return pars; +} + + +/* ------------------------------------------------------------------------------------ */ + + +int bits2byte(char bits[]) { + int i, byteval=0, d=1; + for (i = 0; i < 8; i++) { // little endian + /* for (i = 7; i >= 0; i--) { // big endian */ + if (bits[i] == 1) byteval += d; + else if (bits[i] == 0) byteval += 0; + else return 0x100; + d <<= 1; + } + return byteval; +} + + +void inc_bufpos() { + bufpos = (bufpos+1) % HEADLEN; +} + +int compare() { + int i=0, j = bufpos; + + while (i < HEADLEN) { + if (j < 0) j = HEADLEN-1; + if (buf[j] != header[HEADOFS+HEADLEN-1-i]) break; + j--; + i++; + } + return i; +} +/* +ui8_t xorbyte(int pos) { + return xframe[pos] ^ mask[pos % MASK_LEN]; +} +*/ +ui8_t framebyte(int pos) { + return frame[pos]; +} + + +/* ------------------------------------------------------------------------------------ */ +/* + * Convert GPS Week and Seconds to Modified Julian Day. + * - Adapted from sci.astro FAQ. + * - Ignores UTC leap seconds. + */ +void Gps2Date(long GpsWeek, long GpsSeconds, int *Year, int *Month, int *Day) { + + long GpsDays, Mjd; + long J, C, Y, M; + + GpsDays = GpsWeek * 7 + (GpsSeconds / 86400); + Mjd = 44244 + GpsDays; + + J = Mjd + 2468570; + C = 4 * J / 146097; + J = J - (146097 * C + 3) / 4; + Y = 4000 * (J + 1) / 1461001; + J = J - 1461 * Y / 4 + 31; + M = 80 * J / 2447; + *Day = J - 2447 * M / 80; + J = M / 11; + *Month = M + 2 - (12 * J); + *Year = 100 * (C - 49) + Y + J; +} +/* ------------------------------------------------------------------------------------ */ + +/* + Pos: SubHeader, 1+1 byte (ID+LEN) +0x039: 7928 FrameNumber+SondeID + +(0x050: 0732 CalFrames 0x00..0x32) +0x065: 7A2A +0x093: 7C1E GPS Week + TOW +0x0B5: 7D59 +0x112: 7B15 ECEF (X,Y,Z) Coordinates +0x12B: 7611 00 +0x12B: 7Exx AUX-xdata +*/ + +#define pos_FrameNb 0x03B // 2 byte +#define pos_SondeID 0x03D // 8 byte +#define pos_CalData 0x052 // 1 byte, counter 0x00..0x32 +#define pos_Calfreq 0x055 // 2 byte, calfr 0x00 +#define pos_Calburst 0x05E // 1 byte, calfr 0x02 +// ? #define pos_Caltimer 0x05A // 2 byte, calfr 0x02 ? +#define pos_CalRSTyp 0x05B // 8 byte, calfr 0x21 (+2 byte in 0x22?) + // weitere chars in calfr 0x22/0x23; weitere ID +#define pos_GPSweek 0x095 // 2 byte +#define pos_GPSTOW 0x097 // 4 byte +#define pos_GPSecefX 0x114 // 4 byte +#define pos_GPSecefY 0x118 // 4 byte +#define pos_GPSecefZ 0x11C // 4 byte +#define pos_GPSecefV 0x120 // 3*2 byte + + +#define pos_Hframe 0x039 +#define HEAD_frame 0x7928 +#define HXOR_frame 0x1713 // ^0x6E3B=0x7928 + +#define pos_Htow 0x093 +#define HEAD_tow 0x7C1E +#define HXOR_tow 0x9667 // ^0xEA79=0x7C1E + +#define pos_Hkoord 0x112 +#define HEAD_koord 0x7B15 +#define HXOR_koord 0xB9FF // ^0xC2EA=0x7B15 + +#define pos_Haux 0x12B +#define HEAD_aux 0x7E00 // LEN variable + +/* +int crc16x(ui8_t bytes[], int start, int len) { + int crc16poly = 0x1021; + int rem = 0xFFFF, i, j; + int xbyte; + + if (start+len >= FRAME_LEN) return -1; + + for (i = 0; i < len; i++) { + xbyte = xorbyte(start+i); + rem = rem ^ (xbyte << 8); + for (j = 0; j < 8; j++) { + if (rem & 0x8000) { + rem = (rem << 1) ^ crc16poly; + } + else { + rem = (rem << 1); + } + rem &= 0xFFFF; + } + } + return rem; +} +*/ +int crc16(ui8_t bytes[], int start, int len) { + int crc16poly = 0x1021; + int rem = 0xFFFF, i, j; + int byte; + + if (start+len >= FRAME_LEN) return -1; + + for (i = 0; i < len; i++) { + byte = framebyte(start+i); + rem = rem ^ (byte << 8); + for (j = 0; j < 8; j++) { + if (rem & 0x8000) { + rem = (rem << 1) ^ crc16poly; + } + else { + rem = (rem << 1); + } + rem &= 0xFFFF; + } + } + return rem; +} + + +int get_FrameNb() { + int i; + unsigned byte; + ui8_t frnr_bytes[2]; + int frnr; + + for (i = 0; i < 2; i++) { + byte = framebyte(pos_FrameNb + i); + frnr_bytes[i] = byte; + } + + frnr = frnr_bytes[0] + (frnr_bytes[1] << 8); + gpx.frnr = frnr; + + return 0; +} + +int get_SondeID() { + int i; + unsigned byte; + ui8_t sondeid_bytes[8]; + + for (i = 0; i < 8; i++) { + byte = framebyte(pos_SondeID + i); + if ((byte < 0x20) || (byte > 0x7E)) return -1; + sondeid_bytes[i] = byte; + } + + for (i = 0; i < 8; i++) { + gpx.id[i] = sondeid_bytes[i]; + } + gpx.id[8] = '\0'; + + return 0; +} + +int get_GPSweek() { + int i; + unsigned byte; + ui8_t gpsweek_bytes[2]; + int gpsweek; + + for (i = 0; i < 2; i++) { + byte = framebyte(pos_GPSweek + i); + gpsweek_bytes[i] = byte; + } + + gpsweek = gpsweek_bytes[0] + (gpsweek_bytes[1] << 8); + if (gpsweek < 0) { gpx.week = -1; return -1; } + gpx.week = gpsweek; + + return 0; +} + +char weekday[7][3] = { "So", "Mo", "Di", "Mi", "Do", "Fr", "Sa"}; + +int get_GPStime() { + int i; + unsigned byte; + ui8_t gpstime_bytes[4]; + int gpstime = 0, // 32bit + day; + + int crclen; + int crcdat; + int crcpos = pos_Htow; + + // xorbyte(crcpos) == (HEAD_tow>>8) & 0xFF ? + if ( option_crc ) { + crclen = framebyte(crcpos+1); + crcdat = framebyte(crcpos+2+crclen) | (framebyte(crcpos+2+crclen+1)<<8); + if ( crcdat != crc16(frame, crcpos+2, crclen) ) { + return -2; // CRC error + } + } + + + for (i = 0; i < 4; i++) { + byte = framebyte(pos_GPSTOW + i); + gpstime_bytes[i] = byte; + } + + memcpy(&gpstime, gpstime_bytes, 4); + //ms = gpstime % 1000; + gpstime /= 1000; + + gpx.gpssec = gpstime; + + day = gpstime / (24 * 3600); + gpstime %= (24*3600); + + if ((day < 0) || (day > 6)) return -1; + gpx.wday = day; + gpx.std = gpstime / 3600; + gpx.min = (gpstime % 3600) / 60; + gpx.sek = gpstime % 60; + + return 0; +} + + +#define EARTH_a 6378137.0 +#define EARTH_b 6356752.31424518 +#define EARTH_a2_b2 (EARTH_a*EARTH_a - EARTH_b*EARTH_b) + +double a = EARTH_a, + b = EARTH_b, + a_b = EARTH_a2_b2, + e2 = EARTH_a2_b2 / (EARTH_a*EARTH_a), + ee2 = EARTH_a2_b2 / (EARTH_b*EARTH_b); + +void ecef2elli(double X[], double *lat, double *lon, double *h) { + double phi, lam, R, p, t; + + lam = atan2( X[1] , X[0] ); + + p = sqrt( X[0]*X[0] + X[1]*X[1] ); + t = atan2( X[2]*a , p*b ); + + phi = atan2( X[2] + ee2 * b * sin(t)*sin(t)*sin(t) , + p - e2 * a * cos(t)*cos(t)*cos(t) ); + + R = a / sqrt( 1 - e2*sin(phi)*sin(phi) ); + *h = p / cos(phi) - R; + + *lat = phi*180/M_PI; + *lon = lam*180/M_PI; +} + +int get_GPSkoord() { + int i, k; + unsigned byte; + ui8_t XYZ_bytes[4]; + int XYZ; // 32bit + double X[3], lat, lon, h; + ui8_t gpsVel_bytes[2]; + short vel16; // 16bit + double V[3], phi, lam, alpha, dir; + + int crclen; + int crcdat; + int crcpos = pos_Hkoord; + + // xorbyte(crcpos) == (HEAD_koord>>8) & 0xFF ? + if ( option_crc ) { + crclen = framebyte(crcpos+1); + crcdat = framebyte(crcpos+2+crclen) | (framebyte(crcpos+2+crclen+1)<<8); + if ( crcdat != crc16(frame, crcpos+2, crclen) ) { + return -2; // CRC error + } + } + + for (k = 0; k < 3; k++) { + + for (i = 0; i < 4; i++) { + byte = frame[pos_GPSecefX + 4*k + i]; + XYZ_bytes[i] = byte; + } + memcpy(&XYZ, XYZ_bytes, 4); + X[k] = XYZ / 100.0; + + for (i = 0; i < 2; i++) { + byte = frame[pos_GPSecefV + 2*k + i]; + gpsVel_bytes[i] = byte; + } + vel16 = gpsVel_bytes[0] | gpsVel_bytes[1] << 8; + V[k] = vel16 / 100.0; + + } + + + // ECEF-Position + ecef2elli(X, &lat, &lon, &h); + gpx.lat = lat; + gpx.lon = lon; + gpx.h = h; + if ((h < -1000) || (h > 80000)) return -1; + + + // ECEF-Velocities + // ECEF-Vel -> NorthEastUp + phi = lat*M_PI/180.0; + lam = lon*M_PI/180.0; + gpx.vN = -V[0]*sin(phi)*cos(lam) - V[1]*sin(phi)*sin(lam) + V[2]*cos(phi); + gpx.vE = -V[0]*sin(lam) + V[1]*cos(lam); + gpx.vU = V[0]*cos(phi)*cos(lam) + V[1]*cos(phi)*sin(lam) + V[2]*sin(phi); + + // NEU -> HorDirVer + gpx.vH = sqrt(gpx.vN*gpx.vN+gpx.vE*gpx.vE); +///* + alpha = atan2(gpx.vN, gpx.vE)*180/M_PI; // ComplexPlane (von x-Achse nach links) - GeoMeteo (von y-Achse nach rechts) + dir = 90-alpha; // z=x+iy= -> i*conj(z)=y+ix=re(i(pi/2-t)), Achsen und Drehsinn vertauscht + if (dir < 0) dir += 360; // atan2(y,x)=atan(y/x)=pi/2-atan(x/y) , atan(1/t) = pi/2 - atan(t) + gpx.vD2 = dir; +//*/ + dir = atan2(gpx.vE, gpx.vN) * 180 / M_PI; + if (dir < 0) dir += 360; + gpx.vD = dir; + + return 0; +} + +int get_Aux() { +// +// "Ozone Sounding with Vaisala Radiosonde RS41" user's guide +// + int i, auxlen, auxcrc, count7E, pos7E; + + count7E = 0; + pos7E = pos_Haux; + + // 7Exx: xdata + while ( pos7E < FRAME_LEN && framebyte(pos7E) == 0x7E ) { + + auxlen = framebyte(pos_Haux+1); + auxcrc = framebyte(pos_Haux+2+auxlen) | (framebyte(pos_Haux+2+auxlen+1)<<8); + + if (count7E == 0) fprintf(stdout, "\n # xdata = "); + else fprintf(stdout, " # "); + + if ( auxcrc == crc16(frame, pos_Haux+2, auxlen) ) { + //fprintf(stdout, " # %02x : ", framebyte(pos_Haux+2)); + for (i = 1; i < auxlen; i++) { + fprintf(stdout, "%c", framebyte(pos_Haux+2+i)); + } + count7E++; + pos7E += 2+auxlen+2; + } + else pos7E = FRAME_LEN; + } + + return count7E; +} + +int get_Cal() { + int i; + unsigned byte; + ui8_t calfr = 0; + ui8_t burst = 0; + int freq = 0, f0 = 0, f1 = 0; + char sondetyp[9]; + + byte = framebyte(pos_CalData); + calfr = byte; + + if (option_verbose == 3) { + fprintf(stdout, "\n"); // fflush(stdout); + fprintf(stdout, "[%5d] ", gpx.frnr); + fprintf(stdout, " 0x%02x: ", calfr); + for (i = 0; i < 16; i++) { + byte = framebyte(pos_CalData+1+i); + fprintf(stdout, "%02x ", byte); + } + } + + if (calfr == 0x02 && option_verbose /*== 2*/) { + byte = framebyte(pos_Calburst); + burst = byte; + fprintf(stdout, ": BK %02X ", burst); + } + + if (calfr == 0x00 && option_verbose) { + byte = framebyte(pos_Calfreq) & 0xC0; // erstmal nur oberste beiden bits + f0 = (byte * 10) / 64; // 0x80 -> 1/2, 0x40 -> 1/4 ; dann mal 40 + byte = framebyte(pos_Calfreq+1); + f1 = 40 * byte; + freq = 400000 + f1+f0; // kHz; + fprintf(stdout, ": fq %d ", freq); + } + + if (calfr == 0x21 && option_verbose /*== 2*/) { // eventuell noch zwei bytes in 0x22 + for (i = 0; i < 9; i++) sondetyp[i] = 0; + for (i = 0; i < 8; i++) { + byte = framebyte(pos_CalRSTyp + i); + if ((byte >= 0x20) && (byte < 0x7F)) sondetyp[i] = byte; + else if (byte == 0x00) sondetyp[i] = '\0'; + } + fprintf(stdout, ": %s ", sondetyp); + } + + return 0; +} + +/* ------------------------------------------------------------------------------------ */ + +int rs_ecc(int msglen) { + + int i, ret = 0; + int errors1, errors2, + errpos1[rs_R], errpos2[rs_R]; + + if (msglen > FRAME_LEN) msglen = FRAME_LEN; + cfg_rs41.frmlen = msglen; + cfg_rs41.msglen = (msglen-56)/2; // msgpos=56; + + for (i = msglen; i < FRAME_LEN; i++) frame[i] = 0; + + + for (i = 0; i < cfg_rs41.msglen; i++) { + codeword1[rs_K-1-i] = frame[cfg_rs41.msgpos+ 2*i]; + codeword2[rs_K-1-i] = frame[cfg_rs41.msgpos+1+2*i]; + } + + for (i = 0; i < rs_R; i++) { + codeword1[rs_N-1-i] = frame[cfg_rs41.parpos+ i]; + codeword2[rs_N-1-i] = frame[cfg_rs41.parpos+rs_R+i]; + } + + errors1 = decode_rs_char(rs, codeword1, errpos1, 0); + errors2 = decode_rs_char(rs, codeword2, errpos2, 0); + +/* + printf("codeword1, "); + printf("errors: %d\n", errors1); + if (errors1 > 0) { + printf("pos: "); + for (i = 0; i < errors1; i++) printf(" %d", errpos1[i]); + printf("\n"); + } + + printf("codeword2, "); + printf("errors: %d\n", errors2); + if (errors2 > 0) { + printf("pos: "); + for (i = 0; i < errors2; i++) printf(" %d", errpos2[i]); + printf("\n"); + } +*/ + + //for (i = 0; i < cfg_rs41.hdrlen; i++) frame[i] = data[i]; + for (i = 0; i < rs_R; i++) { + frame[cfg_rs41.parpos+ i] = codeword1[rs_N-1-i]; + frame[cfg_rs41.parpos+rs_R+i] = codeword2[rs_N-1-i]; + } + for (i = 0; i < cfg_rs41.msglen; i++) { + frame[cfg_rs41.msgpos+ 2*i] = codeword1[rs_K-1-i]; + frame[cfg_rs41.msgpos+1+2*i] = codeword2[rs_K-1-i]; + } + + if (errors1 > 0 || errors2 > 0) ret = 1; + if (errors1 < 0 || errors2 < 0) ret = -1; + return ret; +} + +/* ------------------------------------------------------------------------------------ */ + + +int print_position() { + int err; + + err = 0; + err |= get_FrameNb(); + err |= get_SondeID(); + err |= get_GPSweek(); + err |= get_GPStime(); + err |= get_GPSkoord(); + + if (!err) { + Gps2Date(gpx.week, gpx.gpssec, &gpx.jahr, &gpx.monat, &gpx.tag); + fprintf(stdout, "[%5d] ", gpx.frnr); + fprintf(stdout, "(%s) ", gpx.id); + fprintf(stdout, "%s ", weekday[gpx.wday]); + fprintf(stdout, "%04d-%02d-%02d %02d:%02d:%02d", + gpx.jahr, gpx.monat, gpx.tag, gpx.std, gpx.min, gpx.sek); + if (option_verbose == 3) fprintf(stdout, " (W %d)", gpx.week); + fprintf(stdout, " "); + fprintf(stdout, " lat: %.5f ", gpx.lat); + fprintf(stdout, " lon: %.5f ", gpx.lon); + fprintf(stdout, " h: %.2f ", gpx.h); + //if (option_verbose) + { + //fprintf(stdout, " (%.1f %.1f %.1f) ", gpx.vN, gpx.vE, gpx.vU); + fprintf(stdout," vH: %4.1f D: %5.1f° vV: %3.1f ", gpx.vH, gpx.vD, gpx.vU); + } + get_Cal(); + if (option_verbose > 1) get_Aux(); + fprintf(stdout, "\n"); // fflush(stdout); + } + + return err; +} + +void print_frame(int len) { + int i, ret = 0; + + if (option_ecc) { + ret = rs_ecc(len); + } + + for (i = len; i < FRAME_LEN; i++) { + //xframe[i] = 0; + frame[i] = 0; + } + + if (option_raw) { +/* + for (i = 0; i < len; i++) { + byte = framebyte(i); + fprintf(stdout, "%02x", byte); + } + fprintf(stdout, "\n"); +*/ + for (i = 0; i < len; i++) { + fprintf(stdout, "%02x", frame[i]); + } + if (option_ecc) { + if (ret >= 0) fprintf(stdout, " [OK]"); else fprintf(stdout, " [NO]"); + } + fprintf(stdout, "\n"); +// fprintf(stdout, "\n"); + } + else print_position(); +} + +int main(int argc, char *argv[]) { + + FILE *fp; + char *fpname; + char bitbuf[8]; + int bit_count = 0, + byte_count = FRAMESTART, + header_found = 0, + byte, i; + int bit, len; + + int sumQ, bitQ; + double ratioQ, ratioQ0; + +#ifdef CYGWIN + _setmode(fileno(stdin), _O_BINARY); // _fileno(stdin) + setbuf(stdout, NULL); +#endif + + fpname = argv[0]; + ++argv; + while ((*argv) && (!wavloaded)) { + if ( (strcmp(*argv, "-h") == 0) || (strcmp(*argv, "--help") == 0) ) { + fprintf(stderr, "%s [options] audio.wav\n", fpname); + fprintf(stderr, " options:\n"); + fprintf(stderr, " -v, -vx, -vv (info, aux, info/conf)\n"); + fprintf(stderr, " -r, --raw\n"); + fprintf(stderr, " -i, --invert\n"); + fprintf(stderr, " --crc (check CRC)\n"); + fprintf(stderr, " --avg (moving average)\n"); + fprintf(stderr, " -b (alt. Demod.)\n"); + fprintf(stderr, " --ecc (Reed-Solomon)\n"); + return 0; + } + else if ( (strcmp(*argv, "-v") == 0) || (strcmp(*argv, "--verbose") == 0) ) { + option_verbose = 1; + } + else if (strcmp(*argv, "-vx") == 0) { option_verbose = 2; } + else if (strcmp(*argv, "-vv") == 0) { option_verbose = 3; } + else if (strcmp(*argv, "--crc") == 0) { option_crc = 1; } + else if (strcmp(*argv, "--res") == 0) { option_res = 1; } + else if ( (strcmp(*argv, "-r") == 0) || (strcmp(*argv, "--raw") == 0) ) { + option_raw = 1; + } + else if ( (strcmp(*argv, "-i") == 0) || (strcmp(*argv, "--invert") == 0) ) { + option_inv = 1; + } + else if ( (strcmp(*argv, "--avg") == 0) ) { + option_avg = 1; + } + else if (strcmp(*argv, "-b") == 0) { option_b = 1; } + else if (strcmp(*argv, "--ecc") == 0) { option_ecc = 1; } + else { + fp = fopen(*argv, "rb"); + if (fp == NULL) { + fprintf(stderr, "%s konnte nicht geoeffnet werden\n", *argv); + return -1; + } + wavloaded = 1; + } + ++argv; + } + if (!wavloaded) fp = stdin; + + + i = read_wav_header(fp); + if (i) { + fclose(fp); + return -1; + } + + + if (option_ecc) { + rs = init_rs_char( 8, 0x11d, 0, 1, rs_R, 0); + } + + while (!read_bits_fsk(fp, &bit, &len)) { + + if (len == 0) { // reset_frame(); + if (byte_count > pos_Haux) { + print_frame(byte_count); + bit_count = 0; + byte_count = FRAMESTART; + header_found = 0; + } + //inc_bufpos(); + //buf[bufpos] = 'x'; + continue; // ... + } + + for (i = 0; i < len; i++) { + + inc_bufpos(); + buf[bufpos] = 0x30 + bit; // Ascii + + if (!header_found) { + if (compare() >= HEADLEN) header_found = 1; + } + else { + bitbuf[bit_count] = bit; + bit_count++; + + if (bit_count == 8) { + bit_count = 0; + byte = bits2byte(bitbuf); + //xframe[byte_count] = byte; + frame[byte_count] = byte ^ mask[byte_count % MASK_LEN]; + byte_count++; + if (byte_count == FRAME_LEN) { + byte_count = FRAMESTART; + header_found = 0; + print_frame(FRAME_LEN); + } + } + } + + } + if (header_found && option_b) { + bitstart = 1; + sumQ = 0; + ratioQ0 = 0; + + while ( byte_count < FRAME_LEN ) { + bitQ = read_rawbit(fp, &bit); + if ( bitQ == EOF) break; + sumQ += bitQ; + bitbuf[bit_count] = bit; + bit_count++; + if (bit_count == 8) { + bit_count = 0; + byte = bits2byte(bitbuf); + //xframe[byte_count] = byte; + frame[byte_count] = byte ^ mask[byte_count % MASK_LEN]; + byte_count++; + + ratioQ0 = ratioQ; + ratioQ = sumQ/samples_per_bit; + //printf("# %3d sumQ: %d sumQ/(samples/bit): %.1f\n", byte_count-1, sumQ, sumQ/samples_per_bit); + if (byte_count > NDATA_LEN) { + if (ratioQ > 0.7 && ratioQ0 > 0.7) { + byte_count -= 2; + break; + } + } + sumQ = 0; + } + } + header_found = 0; + print_frame(byte_count); + byte_count = FRAMESTART; + + } + + } + + fclose(fp); + + return 0; +} + +